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Oyo Shima Lighthouse

Fl White 3s🇯🇵Sai, JPOperational

Location & Light Range

About Oyo Shima Lighthouse

Also known as: Oyo Shima (Oyojima)

Oyo Shima lighthouse stands on a cylindrical concrete tower painted white, rising 9.5 meters high from a single-story equipment shelter. Its focal plane reaches 19 meters above sea level. The light emits a single white flash every three seconds, visible for 12.9 nautical miles. Situated on an islet approximately 1 kilometer offshore, it lies about 6 kilometers south of Sai harbor in Aomori Prefecture, Japan. Access to the lighthouse is exclusively by boat, highlighting its remote location.

Why it matters: This light serves as a navigational reference for vessels approaching or leaving Sai harbor, marking the islet it occupies as an offshore hazard.

Light & Optic

Characteristic Signature
Fl White 3s
Flash Type
Flashing
Light Color
White
Interval
3s
Raw Code
Fl W 3s
Focal Height
19m
Geographic Range
12.9NM

Location

City
Sai
Country
🇯🇵Japan
Region
Aomori Prefecture
Sea Region
Located on an islet about 1 km offshore and 6 km south of Sai harbor.
Latitude
41.4034°
Longitude
140.8157°

Nearby Vessels

Flag
Type
Name
Dist.

Tower & Structure

Tower Height
9.5m
Tower Shape
cylindrical
Tower Color
white
Material
concrete

Structure: round cylindrical concrete tower rising from a round 1-story concrete equipment shelter

References & Identifiers

Nearest Port
Sai(2.9 km)
ARLHS No.
JPN-1088
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Frequently Asked Questions

How do mariners identify Oyo Shima Lighthouse at night?+
Oyo Shima displays the characteristic Fl White 3s. Each lighthouse has a unique flash pattern published in the List of Lights, allowing mariners to positively identify it and distinguish it from other navigation aids in the area. The white color may indicate a specific sector or warning zone.
Which ports and harbors does Oyo Shima Lighthouse guide vessels into?+
Oyo Shima Lighthouse assists vessels approaching 5 nearby ports. The closest is Soya at 0.7 NM to the ESE. Other ports served include Sai, Aomori (2.7 NM NE), Hotokegaura (5.5 NM S), Oma (8.6 NM NNE), Kawauchi (14.6 NM SSE). Mariners should consult the relevant chart for full approach and pilotage information.
Is Oyo Shima Lighthouse still active and maintained?+
Yes, Oyo Shima Lighthouse is currently operational. It is actively maintained and continues to emit its characteristic light signal for marine navigation. Most modern lighthouses are automated and monitored remotely by the national maritime authority.
What shipping routes pass near Oyo Shima Lighthouse?+
Oyo Shima Lighthouse is located within the Japan / Korea shipping lane — a busy shipping corridor linking the major ports of Japan and South Korea. This makes it an important navigation reference for commercial shipping traffic in the region.
How can I track vessels near Oyo Shima Lighthouse?+
You can track vessels near Oyo Shima Lighthouse in real time using MarineRadar. The platform shows live AIS positions of ships in the area, including vessel name, type, flag, speed, and course. Use the "Track Vessels Nearby" button on this page to open the live map centered on this lighthouse.